To inform you about serfs, they were considered the base or main structure of the economic system, due to the fact that they supplied labor, goods, and any other necessities to the entire kingdom.
They were basically slaves, considering that they worked on the lands for their landlords, paid taxes and were responsible for nearly EVERYTHING that was involved with the lords property.
Fun Fact: The most common serf was a villain.
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A and c are not correct and Germany didn't have an alliance with France so the answer is B
Benito Mussolini gotten control over Italy's government by outlawing political parties.
They learn different methods each time they uncover early modern humans